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United States Patent | 5,537,039 |
Le Roux ,   et al. | July 16, 1996 |
Slabs are selected using a combination of a slab select gradient and selective RF excitation pulses to acquire 3D NMR data. Thinner 2D slices are selected within each slab by employing virtual frequency encoding of the acquired NMR signals. This encoding is achieved by stepping the value of the gradient in the slab select direction and concurrently changing the time interval between RF excitation and acquisition of the resulting NMR echo signal. A gradient recalled echo pulse sequence and a fast spin echo pulse sequence are described.
Inventors: | Le Roux; Patrick L. (Palaiseau, FR); Sun; Yi (Waukesha, WI) |
Assignee: | General Electric Company (Milwaukee, WI) |
Appl. No.: | 541545 |
Filed: | October 10, 1995 |
Current U.S. Class: | 324/309; 324/307 |
Intern'l Class: | G01V 003/00 |
Field of Search: | 324/300,303,307,309,310,311,312,313,314,318,322 128/653.1,653.2,653.8 |
4857846 | Aug., 1989 | Carlson | 324/309. |
4970457 | Nov., 1990 | Kaufman et al. | 324/309. |
5157330 | Oct., 1992 | Kaufman et al. | 324/318. |
5168228 | Dec., 1992 | Mansfield et al. | 324/309. |